I perceive both QNAP and Synology as massively flawed tech, that can’t be relied upon. Too many occurrences of both going haywire for no good reason, crashing, destroying HDDs and so on and so forth.
For home appliance, I’d rather buy an old i3/i5 rig, upgrade it a little, put some storage space on it and rely on a scheduled batch script to send critical folders/files from all connected devices to it, than buy this overpriced and overhyped piece of crap.